DuiLib 之 UIVerticalLayout

#ifndef __UIVERTICALLAYOUT_H__
#define __UIVERTICALLAYOUT_H__

#pragma once

namespace DuiLib
{
	class UILIB_API CVerticalLayoutUI : public CContainerUI
	{
	public:
		CVerticalLayoutUI();

		LPCTSTR GetClass() const;
		LPVOID GetInterface(LPCTSTR pstrName);
		UINT GetControlFlags() const;

		void SetSepHeight(int iHeight);
		int GetSepHeight() const;
		void SetSepImmMode(bool bImmediately);
		bool IsSepImmMode() const;
		void SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue);
		void DoEvent(TEventUI& event);

		void SetPos(RECT rc);
		void DoPostPaint(HDC hDC, const RECT& rcPaint);

		RECT GetThumbRect(bool bUseNew = false) const;

	protected:
		int m_iSepHeight;
		UINT m_uButtonState;
		POINT ptLastMouse;
		RECT m_rcNewPos;
		bool m_bImmMode;
	};
}
#endif // __UIVERTICALLAYOUT_H__

#include "stdafx.h"
#include "UIVerticalLayout.h"

namespace DuiLib
{
	CVerticalLayoutUI::CVerticalLayoutUI() : m_iSepHeight(0), m_uButtonState(0), m_bImmMode(false)
	{
		ptLastMouse.x = ptLastMouse.y = 0;
		::ZeroMemory(&m_rcNewPos, sizeof(m_rcNewPos));
	}

	LPCTSTR CVerticalLayoutUI::GetClass() const
	{
		return _T("VerticalLayoutUI");
	}

	LPVOID CVerticalLayoutUI::GetInterface(LPCTSTR pstrName)
	{
		if( _tcscmp(pstrName, DUI_CTR_VERTICALLAYOUT) == 0 ) return static_cast<CVerticalLayoutUI*>(this);
		return CContainerUI::GetInterface(pstrName);
	}

	UINT CVerticalLayoutUI::GetControlFlags() const
	{
		if( IsEnabled() && m_iSepHeight != 0 ) return UIFLAG_SETCURSOR;
		else return 0;
	}

	void CVerticalLayoutUI::SetPos(RECT rc)
	{
		CControlUI::SetPos(rc);
		rc = m_rcItem;

		// Adjust for inset
		rc.left += m_rcInset.left;
		rc.top += m_rcInset.top;
		rc.right -= m_rcInset.right;
		rc.bottom -= m_rcInset.bottom;
		if( m_pVerticalScrollBar && m_pVerticalScrollBar->IsVisible() ) rc.right -= m_pVerticalScrollBar->GetFixedWidth();
		if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() ) rc.bottom -= m_pHorizontalScrollBar->GetFixedHeight();

		if( m_items.GetSize() == 0) {
			ProcessScrollBar(rc, 0, 0);
			return;
		}

		// Determine the minimum size
		SIZE szAvailable = { rc.right - rc.left, rc.bottom - rc.top };
		if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() ) 
			szAvailable.cx += m_pHorizontalScrollBar->GetScrollRange();

		int nAdjustables = 0;
		int cyFixed = 0;
		int nEstimateNum = 0;
		for( int it1 = 0; it1 < m_items.GetSize(); it1++ ) {
			CControlUI* pControl = static_cast<CControlUI*>(m_items[it1]);
			if( !pControl->IsVisible() ) continue;
			if( pControl->IsFloat() ) continue;
			SIZE sz = pControl->EstimateSize(szAvailable);
			if( sz.cy == 0 ) {
				nAdjustables++;
			}
			else {
				if( sz.cy < pControl->GetMinHeight() ) sz.cy = pControl->GetMinHeight();
				if( sz.cy > pControl->GetMaxHeight() ) sz.cy = pControl->GetMaxHeight();
			}
			cyFixed += sz.cy + pControl->GetPadding().top + pControl->GetPadding().bottom;
			nEstimateNum++;
		}
		cyFixed += (nEstimateNum - 1) * m_iChildPadding;

		// Place elements
		int cyNeeded = 0;
		int cyExpand = 0;
		if( nAdjustables > 0 ) cyExpand = MAX(0, (szAvailable.cy - cyFixed) / nAdjustables);
		// Position the elements
		SIZE szRemaining = szAvailable;
		int iPosY = rc.top;
		if( m_pVerticalScrollBar && m_pVerticalScrollBar->IsVisible() ) {
			iPosY -= m_pVerticalScrollBar->GetScrollPos();
		}
		int iPosX = rc.left;
		if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() ) {
			iPosX -= m_pHorizontalScrollBar->GetScrollPos();
		}
		int iAdjustable = 0;
		int cyFixedRemaining = cyFixed;
		for( int it2 = 0; it2 < m_items.GetSize(); it2++ ) {
			CControlUI* pControl = static_cast<CControlUI*>(m_items[it2]);
			if( !pControl->IsVisible() ) continue;
			if( pControl->IsFloat() ) {
				SetFloatPos(it2);
				continue;
			}

			RECT rcPadding = pControl->GetPadding();
			szRemaining.cy -= rcPadding.top;
			SIZE sz = pControl->EstimateSize(szRemaining);
			if( sz.cy == 0 ) {
				iAdjustable++;
				sz.cy = cyExpand;
				// Distribute remaining to last element (usually round-off left-overs)
				if( iAdjustable == nAdjustables ) {
					sz.cy = MAX(0, szRemaining.cy - rcPadding.bottom - cyFixedRemaining);
				} 
				if( sz.cy < pControl->GetMinHeight() ) sz.cy = pControl->GetMinHeight();
				if( sz.cy > pControl->GetMaxHeight() ) sz.cy = pControl->GetMaxHeight();
			}
			else {
				if( sz.cy < pControl->GetMinHeight() ) sz.cy = pControl->GetMinHeight();
				if( sz.cy > pControl->GetMaxHeight() ) sz.cy = pControl->GetMaxHeight();
				cyFixedRemaining -= sz.cy;
			}

			sz.cx = pControl->GetFixedWidth();
			if( sz.cx == 0 ) sz.cx = szAvailable.cx - rcPadding.left - rcPadding.right;
			if( sz.cx < 0 ) sz.cx = 0;
			if( sz.cx < pControl->GetMinWidth() ) sz.cx = pControl->GetMinWidth();
			if( sz.cx > pControl->GetMaxWidth() ) sz.cx = pControl->GetMaxWidth();

			RECT rcCtrl = { iPosX + rcPadding.left, iPosY + rcPadding.top, iPosX + rcPadding.left + sz.cx, iPosY + sz.cy + rcPadding.top + rcPadding.bottom };
			pControl->SetPos(rcCtrl);

			iPosY += sz.cy + m_iChildPadding + rcPadding.top + rcPadding.bottom;
			cyNeeded += sz.cy + rcPadding.top + rcPadding.bottom;
			szRemaining.cy -= sz.cy + m_iChildPadding + rcPadding.bottom;
		}
		cyNeeded += (nEstimateNum - 1) * m_iChildPadding;

		// Process the scrollbar
		ProcessScrollBar(rc, 0, cyNeeded);
	}

	void CVerticalLayoutUI::DoPostPaint(HDC hDC, const RECT& rcPaint)
	{
		if( (m_uButtonState & UISTATE_CAPTURED) != 0 && !m_bImmMode ) {
			RECT rcSeparator = GetThumbRect(true);
			CRenderEngine::DrawColor(hDC, rcSeparator, 0xAA000000);
		}
	}

	void CVerticalLayoutUI::SetSepHeight(int iHeight)
	{
		m_iSepHeight = iHeight;
	}

	int CVerticalLayoutUI::GetSepHeight() const
	{
		return m_iSepHeight;
	}

	void CVerticalLayoutUI::SetSepImmMode(bool bImmediately)
	{
		if( m_bImmMode == bImmediately ) return;
		if( (m_uButtonState & UISTATE_CAPTURED) != 0 && !m_bImmMode && m_pManager != NULL ) {
			m_pManager->RemovePostPaint(this);
		}

		m_bImmMode = bImmediately;
	}

	bool CVerticalLayoutUI::IsSepImmMode() const
	{
		return m_bImmMode;
	}

	void CVerticalLayoutUI::SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue)
	{
		if( _tcscmp(pstrName, _T("sepheight")) == 0 ) SetSepHeight(_ttoi(pstrValue));
		else if( _tcscmp(pstrName, _T("sepimm")) == 0 ) SetSepImmMode(_tcscmp(pstrValue, _T("true")) == 0);
		else CContainerUI::SetAttribute(pstrName, pstrValue);
	}

	void CVerticalLayoutUI::DoEvent(TEventUI& event)
	{
		if( m_iSepHeight != 0 ) {
			if( event.Type == UIEVENT_BUTTONDOWN && IsEnabled() )
			{
				RECT rcSeparator = GetThumbRect(false);
				if( ::PtInRect(&rcSeparator, event.ptMouse) ) {
					m_uButtonState |= UISTATE_CAPTURED;
					ptLastMouse = event.ptMouse;
					m_rcNewPos = m_rcItem;
					if( !m_bImmMode && m_pManager ) m_pManager->AddPostPaint(this);
					return;
				}
			}
			if( event.Type == UIEVENT_BUTTONUP )
			{
				if( (m_uButtonState & UISTATE_CAPTURED) != 0 ) {
					m_uButtonState &= ~UISTATE_CAPTURED;
					m_rcItem = m_rcNewPos;
					if( !m_bImmMode && m_pManager ) m_pManager->RemovePostPaint(this);
					NeedParentUpdate();
					return;
				}
			}
			if( event.Type == UIEVENT_MOUSEMOVE )
			{
				if( (m_uButtonState & UISTATE_CAPTURED) != 0 ) {
					LONG cy = event.ptMouse.y - ptLastMouse.y;
					ptLastMouse = event.ptMouse;
					RECT rc = m_rcNewPos;
					if( m_iSepHeight >= 0 ) {
						if( cy > 0 && event.ptMouse.y < m_rcNewPos.bottom + m_iSepHeight ) return;
						if( cy < 0 && event.ptMouse.y > m_rcNewPos.bottom ) return;
						rc.bottom += cy;
						if( rc.bottom - rc.top <= GetMinHeight() ) {
							if( m_rcNewPos.bottom - m_rcNewPos.top <= GetMinHeight() ) return;
							rc.bottom = rc.top + GetMinHeight();
						}
						if( rc.bottom - rc.top >= GetMaxHeight() ) {
							if( m_rcNewPos.bottom - m_rcNewPos.top >= GetMaxHeight() ) return;
							rc.bottom = rc.top + GetMaxHeight();
						}
					}
					else {
						if( cy > 0 && event.ptMouse.y < m_rcNewPos.top ) return;
						if( cy < 0 && event.ptMouse.y > m_rcNewPos.top + m_iSepHeight ) return;
						rc.top += cy;
						if( rc.bottom - rc.top <= GetMinHeight() ) {
							if( m_rcNewPos.bottom - m_rcNewPos.top <= GetMinHeight() ) return;
							rc.top = rc.bottom - GetMinHeight();
						}
						if( rc.bottom - rc.top >= GetMaxHeight() ) {
							if( m_rcNewPos.bottom - m_rcNewPos.top >= GetMaxHeight() ) return;
							rc.top = rc.bottom - GetMaxHeight();
						}
					}

					CDuiRect rcInvalidate = GetThumbRect(true);
					m_rcNewPos = rc;
					m_cxyFixed.cy = m_rcNewPos.bottom - m_rcNewPos.top;

					if( m_bImmMode ) {
						m_rcItem = m_rcNewPos;
						NeedParentUpdate();
					}
					else {
						rcInvalidate.Join(GetThumbRect(true));
						rcInvalidate.Join(GetThumbRect(false));
						if( m_pManager ) m_pManager->Invalidate(rcInvalidate);
					}
					return;
				}
			}
			if( event.Type == UIEVENT_SETCURSOR )
			{
				RECT rcSeparator = GetThumbRect(false);
				if( IsEnabled() && ::PtInRect(&rcSeparator, event.ptMouse) ) {
					::SetCursor(::LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS)));
					return;
				}
			}
		}
		CContainerUI::DoEvent(event);
	}

	RECT CVerticalLayoutUI::GetThumbRect(bool bUseNew) const
	{
		if( (m_uButtonState & UISTATE_CAPTURED) != 0 && bUseNew) {
			if( m_iSepHeight >= 0 ) 
				return CDuiRect(m_rcNewPos.left, MAX(m_rcNewPos.bottom - m_iSepHeight, m_rcNewPos.top), 
				m_rcNewPos.right, m_rcNewPos.bottom);
			else 
				return CDuiRect(m_rcNewPos.left, m_rcNewPos.top, m_rcNewPos.right, 
				MIN(m_rcNewPos.top - m_iSepHeight, m_rcNewPos.bottom));
		}
		else {
			if( m_iSepHeight >= 0 ) 
				return CDuiRect(m_rcItem.left, MAX(m_rcItem.bottom - m_iSepHeight, m_rcItem.top), m_rcItem.right, 
				m_rcItem.bottom);
			else 
				return CDuiRect(m_rcItem.left, m_rcItem.top, m_rcItem.right, 
				MIN(m_rcItem.top - m_iSepHeight, m_rcItem.bottom));

		}
	}
}